Move request package into public/shared folder (#24420)

* move request package to public/shared

* updated app-layers

* update app layer

* remove original package location

server/channels/app/channel.go

@@ -15,9 +15,8 @@ import (
 	"github.com/mattermost/mattermost/server/public/plugin"
 	"github.com/mattermost/mattermost/server/public/shared/i18n"
 	"github.com/mattermost/mattermost/server/public/shared/mlog"
+	"github.com/mattermost/mattermost/server/public/shared/request"
 	pUtils "github.com/mattermost/mattermost/server/public/utils"
-
-	"github.com/mattermost/mattermost/server/v8/channels/app/request"
 	"github.com/mattermost/mattermost/server/v8/channels/product"
 	"github.com/mattermost/mattermost/server/v8/channels/store"
 	"github.com/mattermost/mattermost/server/v8/channels/store/sqlstore"